Update docstring for tf.linalg.matvec
Update docstring for tf.linalg.matvec

In tensorflow, `matvec` is exposed as `tf.linalg.matvec`
but in the docstring `tf.matvec` is used instead.

This fix fixes the docstring `tf.matvec` => `tf.linalg.matvec`

This fix fixes 31923.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

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